TY - JOUR
T1 - Microstructure observations in rare earth element Gd-modified Ti-44 at% Al
AU - Li, W.
AU - Inkson, B.
AU - Horita, Z.
AU - Xia, K.
N1 - Funding Information:
We are grateful to Dr. A. Morton, Mr. D. Jones and Mr. R. Allen of the Division of Manufacturing Science and Technology of CSIRO, Mr. X. Wu of the University of Melbourne and Prof. C. Liu of Chongqing University for their support and assistance in melting and hot pressing the materials used. KX is grateful to Prof. J. Titchmarsh for his help with STEM and acknowledges the permission by Prof. B. Cantor to use the facilities at Oxford University. WL is grateful to Dr. Ohishi for his help with TEM and acknowledges the permission by Prof. M. Nemoto to use the facilities at Kyushu University. This project was partly funded by the Australian Research Council and a University of Melbourne special grant.
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2000
Y1 - 2000
N2 - Rare earth element Gd (0.15 at%) was added to Ti-44 at% Al to refine the microstructure. Almost all of the Gd atoms were found to form an oxide phase which was tentatively identified as Gd2TiO5. In the as-cast ingot the oxide phase possessed a complicated "finger" shaped morphology and formed a networked structure between the primary crystals. This morphology was broken down in the subsequent heat treatment at 1350°C to become discrete particles in the form of particulate, platelets or rods, often with a faceted appearance, although clusters of the particles reminiscent of their as-cast morphology were common. The distribution of the particles was improved by hot pressing which appeared to reduce the particle size and de-cluster them. Although the particles were not actually pinning the grain boundaries, their distribution seemed to have a significant effect on lamellar grain sizes after heat treatment. The addition of Gd appeared also to promote the formation of lamellae during cooling.
AB - Rare earth element Gd (0.15 at%) was added to Ti-44 at% Al to refine the microstructure. Almost all of the Gd atoms were found to form an oxide phase which was tentatively identified as Gd2TiO5. In the as-cast ingot the oxide phase possessed a complicated "finger" shaped morphology and formed a networked structure between the primary crystals. This morphology was broken down in the subsequent heat treatment at 1350°C to become discrete particles in the form of particulate, platelets or rods, often with a faceted appearance, although clusters of the particles reminiscent of their as-cast morphology were common. The distribution of the particles was improved by hot pressing which appeared to reduce the particle size and de-cluster them. Although the particles were not actually pinning the grain boundaries, their distribution seemed to have a significant effect on lamellar grain sizes after heat treatment. The addition of Gd appeared also to promote the formation of lamellae during cooling.
UR - http://www.scopus.com/inward/record.url?scp=0005824348&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0005824348&partnerID=8YFLogxK
U2 - 10.1016/s0966-9795(99)00156-9
DO - 10.1016/s0966-9795(99)00156-9
M3 - Conference article
AN - SCOPUS:0005824348
SN - 0966-9795
VL - 8
SP - 519
EP - 523
JO - Intermetallics
JF - Intermetallics
IS - 5-6
T2 - 5th IUMRS International Conference on Advanced Materials - Symposium D: Intermetallic Compounds and Bulk Metallic Glasses
Y2 - 13 June 1999 through 18 June 1999
ER -